Holding ETH is a stupid move for now, because now ETH prices are no longer an opportunity to increase so they should sell or convert to other coins. Do not hold them for too long.
Holding any coin in this time for a long term is a better idea as all the coins are over sold and all of them will recover to its higher value. We know that Ethereum decreased around 10X from its AH price so if anyone will hold Ethereum for a longer time then in the good market he will get a 10X profit from that.